You can now add any reserved field or custom fields to a signup form. This means marketers can capture more of the data that they rely on when contacts sign up via a signup form.This means marketers can capture more of the data that they rely on when contacts sign up via a signup form. The collected data will then flow directly into Contacts within Marketing Campaigns.
Twilio Changelog
Additions and changes to the Twilio platform
Additions and changes to the Twilio platform